Mining-drill bit and coupling.



0.1. WILLIAMS;

mums DRILL an AND COUPLING.

APPLlCATION FILED MAR. 4.1918.

Patented- Oct. 14,1919.

. n SATES MINING-DRILL BIT-Ann ooUPLIne.

To all whom it may concern: 1

Be it known that I, DAVID J. WILLIAMS, a citizen of the United States, residing at Herrin, in the county of Williamson and State of Illinois, have invented certain new and useful Improvements in Mining-Drill Bits and Couplings; and I do declare the followingto be a full, clear, and exact description of-the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its principal 0b]ec't to provide an extremely simple and inexpensive, yet a highly efiicient and durable bit for minin drills, the construction being such that a single metal plate -may be employed'in-the manufacture of the device.

A further object is to provide simple yet eificient coupling means for attachingjthebit to the drill.

, With the foregoing general objects in view,

the invention resides in the novel construetion of the bit hereinafter fully described and claimed, and shown in the accompanying drawing whereiriz;v Figure l is a perspective view of the invention applied'to a mining .drill stem;

Fig. 2 is a vertical'section; Fig. 3 is a perspective view of the bit and the coupling by which it is attached to the drill stem; and

Fig. t is a plan. view ofthe blank from to form a pair of cuttingteeth 4/ The lower end of the tongue 2 is provided with a central V-shapednotch 5 and the metal on opposite sides of th-isnotch is bent V laterally .in the same direction as" the teeth 4- to provide additional cut-ting teeth .6. These teeth forma comparatively small bore I and this bore is continuously counterbored by the teeth at.

The upperend of the plate 1 is formed with a relatively large rectangular notch 7 to receive a coupling 8 by means of'whieh the bit is attached to the ordinary drill stem ,of helical form D, said plate being provided Specification of Letters Patent.

the bit 1 were located in -helical form having a fiat- -tially flat drill bit having transversely a canine.

DAVID J. WILLIAMS, or HEREIN, ILLINOIS.

Patented Oct. Mt, 1919.

Application filed March 4, 1918; Serial No. 220,333..

immediately below said notch with-a bolt hole through which one of the bolts 9 of the coupling 8-passes. The metalon opposite sides of the central notch 7 .is bent laterally in' the opposite direction from the teeth 4 and 6 to form a pair of ears 10 adapted to elevate the material toward the drill D so that the latterm.ycome into play to removesuch material from thebore. The coupling-8 above referred to is in the which the drill and the drill bit extend, and

the notch 7 is of such awidth thatthe ears The coupling 8 is v and shape at both ends'for ease of installation.

It is to be observed that the kerfs in the upper and lower ends of the coupling block 8 are disposed in stantially thesame inclination as the helix of the drill stem D. By locating the kerfs in the'manner shown, the inclined-ears are disposed for coaction' with the helix'fof the drill stem in feeding the 'material from the 85 I bore as it is cut by the teeth 4 'andl6. If

the flat end of the drill D, no ears such as 10 could be provided Without constructing thebitof much greater Width than the drill stem, and this would be undesirable since the drill stem would have a tendency to whip and spring in the, comparatively large bore which would .be formed by the bit.

planes at right angles to each other andthat the ears .10 possess subform of a vertically elongated block having kerfs 11 in its upper and lower ends into t 10 abut opposite sides of the aforesaid block and thus hold the bit against lateral tilting.

preferably identicalin size the same plane'with I From the foregoing. taken in connection with the accompanying drawing, it will be obvious that although my invention is of extremely simple and inexpensive nature, it will be highly efficient and desirable. Since the best results are obtained-from the exact construction shown, this construction is preferably employed, but within the scope of the invention as claimed, minor changes might well be made. Ielaim: I In combination, amining drill stem of end, a substanpaced ears on its attaching end, said ears having substantially the same inclination as the helix ofthe drill stem, a coupling block between said drill stem andgbit and having kerfs in its ends disposed in planes at .right angles 00 each other, one of said kerfs receiving said fiat end of the drill stem and the other receiving the part of said bit between said ears, whereby i0 position said ears for coaction with the drill stem helix, and means for securing said bit and drill stein in said keri s.

1n festimeny whereof I have hereunto set my hand 111 the presence of two subscribing witnesses.

DAVID J. WILLIAMS.

iVitnesses: 4

GEOUG. @TEY, H. L. BROWN. 

